The QGP-Stall or Not ?
Abstract
Description
In 1996, D.H. Rischke and M. Gyulassy proposed to use the time-delay signal in Bose-Einstein correlations (BEC) as a signature for the possible formation of a quark-gluon plasma (QGP) in relativistic heavy-ion collisions. In particular, they suggested to measure the ratio of the transversal interferometry radii, $R_{out}/R_{side}$, which can be obtained by fitting experimental BEC data with a parametrization introduced by G. Bertsch et al. in 1988. The transverse radius parameter $R_{out}$ has compared to the transverse radius parameter $R_{side}$ an additional temporal dependence which should be sensitive to a prolonged lifetime of a fireball, in case a QGP was formed in a relativistic heavy-ion collision. This latter phenomenon is known under the term ``QGP stall''. In the following, I shall explain why I believe that the time-delay signal in Bose-Einstein correlations is not a good signature for the possible formation of a QGP.
2 pages, including 1 figure. To be included into a large 60 page upper bound paper representing the "Last Call For Predictions For RHIC" Session of the Fourteenth International Conference on Ultrarelativistic Nucleus- Nucleus collisions "Quark Matter '99", Torino, Italy, May 10-15, 1999. You may also download this file -- and much more -- from http://www.nis.lanl.gov/~bschlei/eprint.html
2 pages, including 1 figure. To be included into a large 60 page upper bound paper representing the "Last Call For Predictions For RHIC" Session of the Fourteenth International Conference on Ultrarelativistic Nucleus- Nucleus collisions "Quark Matter '99", Torino, Italy, May 10-15, 1999. You may also download this file -- and much more -- from http://www.nis.lanl.gov/~bschlei/eprint.html